The correspondence of Charles Darwin  Volume 20, 1872  [electronic resource] . 
editors, Frederick Burkhardt ... [et al.]. 
 - Cambridge, England :  Cambridge University Press,  c2013. 
 - 1 online resource (xxxix, 862 p.) :  ill., photographs. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><br/>Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries. 
<br/><br/><label>ISBN: </label>9781107248878 (electronic bk.) 
<br/><br/><label>Subjects--Personal Names: </label><br/>Darwin, Charles, 1809-1882.  Correspondence. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Evolution (Biology)<br/>Naturalists--England--Correspondence.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Electronic books.
<br/><br/><label>LC Class. No.: </label>QH31.D2  / .C677 2013 
<br/><br/><label>Dewey Class. No.: </label>576.82092